1,STPP 2, high purity 94% 3, used as main auxiliary of synthetic wash 4, good quality at competitive price. STPP Sodium Tripolyphosphate high purity 94% white powderPacking:25kg pp bagSpecification: Na5P3O10,% ,Min.94P2O5,% ,Min.57Insolubles, % Max.0.05PH Value(1%Solution)9.5-10.0Iron (Fe), %, Max.0.015Fluoride (F), %, Max.0.003Chloride (Cl), %, Max.0.025Sulphate (as SO4), %, Max.0.4Bulk density, ...